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Vision.

Published byTracey Greer Modified over 8 years ago

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Presentation on theme: "Vision."— Presentation transcript:

1 Vision

2 Light Energy; waves Wavelength: distance between peaks
determines hue (the color) Amplitude: height of peaks determines intensity of color (brightness) Short wavelength = higher frequency long wavelength = low frequency Large amplitude = bright colors Small amplitude = dull colors

3 Light Energy; waves Wavelength: distance between peaks
determines hue (the color) Amplitude: height of peaks determines intensity of color (brightness) Short wavelength = higher frequency long wavelength = low frequency Large amplitude = bright colors Small amplitude = dull colors

4 Hue (the color we experience)
Colors waves we can see Longest to shortest waves ROY G. BIV The eye can detect 7 million separate hues

5 Structure of the Eye Cornea Pupil Iris Lens Protective covering
Allows more or less light to pass through Iris Colored part of the eye Muscle that surrounds the pupil Lens bends light from pupil to focus Image appears upside down & reversed on retina

6 Structure of the Eye Retina Close your eyes, look left!
Multilayered tissue receptor cells sensitive to light & pressure Close your eyes, look left! Rub the right side of your right eye What do you see?

7 Blind Spot Where the eyeball connects to the optic nerve there is a blind spot. You will never notice it because one eye will always compensate for the other……unless.....

8 Photoreceptor Cells VOLUNTEER PLEASE Retina has many layers Rods
The first layer that light hits are the receptor cells; cone & rods Cones Allows you to see COLOR & FINE DETAIL! Concentration in the center of the retina Roughly 6 million Rods Allows you to see BLACK & WHITE! Roughly 120 million (ratio 20:1) Located on the peripheral of your retina VOLUNTEER PLEASE

9 The Hermann Grid When you look at an area directly there is no dot because you are using your cones but the periphery has dots because the rods are trying to do two things, show you there is a dark area and a light area.

10 Optic Nerve + Optic Chiasm
thalamus

11 Exit Slip: Slap on the door when you leave!
Write down one concept from the video that you understand!

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